Definition 3 [1]}
A non-negative function \(\mathcal {G}: V \subseteq \mathbb {R} \rightarrow \mathbb {R}\)  is called Godunova-Levin function (denoted by
\(\mathcal {G} \in Q(V)\) ) if
\(\mathcal {G}(\zeta m_1+(1-\zeta ) m_2) \le \frac{1}{\zeta } \mathcal {G}(m_1)+\frac{1}{1-\zeta } \mathcal {G}(m_2)\) 
